7. Revenue Recognition

The following table presents disaggregated revenue by business group for the fiscal year ended March 31, 2019 (in thousands):

Following is the geographic revenue information based on the primary operating location of the Company’s customers for the fiscal year ended March 31, 2019 (in thousands):

 

Contract Balances

Our contract liabilities consist of advance payments for systems as well as deferred revenue on service obligations and extended warranties. The current portion of deferred revenue is included in current liabilities under deferred revenue and the non-current portion of deferred revenue is included in other non-current liabilities in the Consolidated Balance Sheets.

As of March 31, 2019 the balance of deferred revenue was approximately $8.2 million compared to $6.6 million as of March 31, 2018. This overall increase in the balance of deferred revenue of $1.6 million during the fiscal year ended March 31, 2019 was comprised of increases in deferred revenue attributable to FPP contracts of $1.3 million, increases in deferred revenue attributable to the DSS program of $0.6 million, offset by a decrease in deferred revenue attributable to deposits of $0.3 million. Changes in deferred revenue during the fiscal year ended March 31, 2019 and 2018 are as follows (in thousands):

 

Deferred revenue attributed to FPP contracts represents the unearned portion of our agreements. FPP agreements are generally paid quarterly in advance with revenue recognized on a straight line basis over the contract period. Deposits are primarily non-refundable cash payments from distributors for future orders.

As of March 31, 2019, approximately $4.9 million of revenue is expected to be recognized from remaining performance obligations for FPP service contracts. The Company expects to recognize revenue on approximately $3.8 million of these remaining performance obligations over the next 12 months and the balance of $1.1 million will be recognized thereafter. Revenue from remaining performance obligations for professional services contracts as of March 31, 2019 was not material.